# >> Standardized Tests >> Other Standardized Tests

How to Estimate IQ Using Standardized Testing

Standardized tests are often used as part of college and graduate school entrance exams, as a means to assess a student's mental potential compared to the mental potential of all other test takers. Since school classes and curriculums vary in difficulty from place to place, standardized tests can supplement grades and teacher recommendations in estimating a student's intelligence.

Instructions

- 1
  Administer the standardized test and collect the results.
- 2
  Calculate the average of the test scores "(x)" by adding them all up and dividing the result by the number of test takers "n".
- 3
  Calculate the standard deviation by subtracting (x) by each individual score "x", then squaring the resulting value. Add up all of these squared values, then divide the result by (n-1) to calculate the standard deviation.
- 4
  Assume that a test-taker with an average score has an average IQ.
- 5
  Add the standard deviation to (x) to determine the score of a test-taker in the upper 68th percentile. Subtract the standard deviation from (x) to determine the score of a test-taker in the lower 68th percentile.
- 6
  Add two standard deviations to (x) to determine the score of a test-taker in the upper 95th percentile. Subtract two standard deviations from (x) to determine the score of a test-taker in the lower 95th percentile.
- 7
  Add three standard deviations to (x) to determine the score of a test-taker in the upper 99th percentile. Subtract three standard deviations from (x) to determine the score of a test-taker in the lower 99th percentile.

About NFPA 1081

Student Learning Objectives for the GED